Code Generating Apparatus, Reference Signal Generating Apparatus, and Methods thereof

1. A reference signal (RS) generator for generating a reference signal, comprising: a sequence generator configured to generate a sequence for reference signal of a first resource block; a first spectrum spreading unit configured to spread spectrums of elements in the sequence for reference signal of the first resource block to be mapped to a first frequency resource of the first resource block, by using a first group of codes; a second spectrum spreading unit configured to spread spectrums of elements in the sequence for reference signal of the first resource block to be mapped to a second frequency resource of the first resource block, by using a second group of codes; the first and second frequency resources are adjacent frequency resources in frequency resource elements used for reference signal transmission in the first resource block, and the first and second groups of codes are mirrors in column to each other; a third spectrum spreading unit configured to spread spectrums of elements of in the sequence for reference signal of the first resource block to be mapped to a third frequency resource of the first resource block, by using a third group of codes; a fourth spectrum spreading unit configured to spread spectrums of elements in the sequence for reference signal of the first resource block to be mapped to a fourth frequency resource of the first resource block, by using a fourth group of codes; the third and fourth frequency resources are adjacent frequency resources in frequency resource elements used for reference signal transmission in the first resource block, and the third and fourth groups of codes are mirrors in column to each other; and a mapping unit configured to map the elements with their spectrums spread by the first and second spectrum spreading units to the first and second frequency resources of the first resource block, respectively, and map the elements with their spectrums spread by the third and fourth spectrum spreading units to the third and fourth frequency resources of the first resource block, respectively.

2. The RS generator according to claim 1 , wherein one of the third and fourth groups of codes is formed by performing a column vector cyclic shift to one of the first and second groups of codes, and the same column vector has different column serial numbers in the first to fourth groups of codes.

3. A reference signal generator for generating a reference signal, which generator comprises: a sequence generator configured to generate a sequence for reference signal of a first resource block and a second resource block; a first spectrum spreading unit configured to spread spectrums of elements in the sequence to be mapped to a first frequency resource of the first resource block, by using a first group of codes; a second spectrum spreading unit configured to spread spectrums of elements in the sequence to be mapped to a second frequency resource of the first resource block, by using a second group of codes; the first and second frequency resources are adjacent frequency resources in frequency resource elements used for reference signal transmission in the first resource block, and the first and second groups of codes are mirrors in column to each other; and a mapping unit configured to map the elements with their spectrums spread by the first and second spectrum spreading units to the first and second frequency resources of the first resource block, respectively, the first spectrum spreading unit spreads spectrums of elements in the sequence to be mapped to a first frequency resource of the second resource block, by using the third group of codes; the second spectrum spreading unit spreads spectrums of elements in the sequence to be mapped to a second frequency resource of the second resource block, by using the fourth group of codes; the first and second frequency resources of the second resource block are adjacent frequency resources in frequency resource elements used for reference signal transmission in the second resource block, Frequency resources used for reference signal of the first resource block and frequency resources used for reference signal of the second resource block is adjacent each other, the third and fourth groups of codes are mirrors in column to each other; the mapping unit maps the elements in the sequence for reference signal of the second resource block with their spectrums spread by the first and second spectrum spreading units to the first and second frequency resources of the second resource block, respectively, one of the third and fourth groups of codes is formed by performing a column vector cyclic shift to one of the first and second groups of codes.

4. The reference signal generator according to claim 3 , wherein the first spectrum spreading unit spreads spectrums of elements in the sequence for reference signal of the second resource block to be mapped to a first frequency resource of the second resource block, by using a fifth group of codes; the second spectrum spreading unit spreads spectrums of elements in the sequence for reference signal of the second resource block to be mapped to a second frequency resource of the second resource block, by using a sixth group of codes; the first and second frequency resources of the second resource block are adjacent frequency resources in frequency resource elements used for reference signal transmission in the second resource block, and the fifth and sixth groups of codes are mirrors in column to each other; the third spectrum spreading unit spreads spectrums of elements in the sequence for reference signal of the second resource block to be mapped to a third frequency resource of the second resource block, by using a seventh group of codes; the fourth spectrum spreading unit spreads spectrums of elements in the sequence for reference signal of the second resource block to be mapped to a fourth frequency resource of the second resource block, by using an eighth group of codes; the third and fourth frequency resources of the second resource block are adjacent frequency resources in frequency resource elements used for reference signal transmission in the second resource block, and the seventh and eighth groups of codes are mirrors in column to each other; the mapping unit further maps the elements in the sequence for reference signal of the second resource block with their spectrums spread by the first to fourth spectrum spreading units to the first to fourth frequency resources of the second resource block, respectively.

5. The reference signal generator according to claim 3 , wherein the same column vector has different column serial numbers in the fifth to eighth groups of codes, one of the fifth and sixth groups of codes is formed by performing a column vector cyclic shift to one of the first and second groups of codes by a first displacement, and one of the seventh and eighth groups of codes is formed by performing a column vector cyclic shift to one of the first and second groups of codes by a second displacement.

6. A reference signal generation method for generating a reference signal, comprising: a sequence generating step for generating a sequence for reference signal of a first resource block; a first spectrum spreading step for spreading spectrums of elements in the sequence for reference signal of the first resource block to be mapped to a first frequency resource of the first resource block, by using a first group of codes; a second spectrum spreading step for spreading spectrums of elements in the sequence for reference signal of the first resource block to be mapped to a second frequency resource of the first resource block, by using a second group of codes; the first and second frequency resources are adjacent frequency resources in frequency resource elements used for reference signal transmission in the first resource block, and the first and second groups of codes are mirrors in column to each other; a third spectrum spreading step for spreading spectrums of elements in the sequence for reference signal of the first resource block to be mapped to a third frequency resource of the first resource block, by using a third group of codes; a fourth spectrum spreading step for spreading spectrums of elements in the sequence for reference signal of the first resource block to be mapped to a fourth frequency resource in the first resource block, by using a fourth group of codes; the third and fourth frequency resources are adjacent frequency resources in frequency resource elements used for reference signal transmission in the first resource block, and the third and fourth groups of codes are mirrors in column to each other; and a mapping step for mapping the elements with their spectrums spread by the first and second spectrum spreading steps to the first and second frequency resources of the first resource block, respectively, and map the elements with their spectrums spread by the third and fourth spectrum spreading steps to the third and fourth frequency resources of the first resource block, respectively.

7. The reference signal generation method according to claim 6 , wherein one of the third and fourth groups of Codes is formed by performing a column vector cyclic shift to one of the first and second groups of Codes, and the same column vector has different column serial numbers in the first to fourth groups of Codes.

8. The RS generation method according to claim 6 , wherein the sequence generation step generates a sequence for reference signal of a second resource block, frequency resources used for reference signal of the first resource block and frequency resources used for reference signal of the second resource block is adjacent each other; the first spectrum spreading step spreads spectrums of elements in the sequence for reference signal of the second resource block to be mapped to a first frequency resource of the second resource block, by using a fifth group of codes; the second spectrum spreading step spreads spectrums of elements in the sequence for reference signal of the second resource block to be mapped to a second frequency resource of the second resource block, by using a sixth group of codes; the first and second frequency resources of the second resource block are adjacent frequency resources in frequency resource elements used for RS transmission in the first resource block, and the fifth and sixth groups of codes are mirrors in column to each other; the third spectrum spreading step spreads spectrums of elements in the sequence for reference signal of the second resource block to be mapped to a third frequency resource of the second resource block, by using a seventh group of codes; the fourth spectrum spreading step spreads spectrums of elements in the sequence for reference signal of the second resource block to be mapped to a fourth frequency resource of the second resource block, by using an eighth group of codes; the third and fourth frequency resources of the second resource block are adjacent frequency resources in frequency resource elements used for RS transmission in the second resource block, and the seventh and eighth groups of Codes are mirrors in column to each other; the mapping step further maps the elements in the sequence for reference signal of the second resource block with their spectrums spread by the first to fourth spectrum spreading units to the first to fourth frequency resources of the second resource block, respectively.

9. The reference signal generation method according to claim 6 , wherein the same column vector has different column serial numbers in the fifth to eighth groups of codes, one of the fifth and sixth groups of codes is formed by performing a column vector cyclic shift to one of the first and second groups of codes by a first displacement, and one of the seventh and eighth groups of codes is formed by performing a column vector cyclic shift to one of the first and second groups of codes by a second displacement.

10. The reference signal generation method according to claim 6 , wherein the first and second groups of codes are both Walsh code sequences or Fourier transform sequences.

11. A code generating apparatus, comprising: a basic orthogonal code acquiring device configured to acquire a group of basic orthogonal codes; a mirror unit configured to perform a mirroring in column on the basic orthogonal codes generated by the basic orthogonal code acquiring device, so as to obtain a first basic orthogonal code group pair, and further to perform a mirroring in column on the basic orthogonal codes having undergone the cyclic shift by the column cyclic shift unit, so as to obtain a second code group pair; a column cyclic shift unit is configured to perform a column vector cyclic shift to the basic orthogonal codes generated by the basic orthogonal code acquiring device, wherein the displacement of the column vector cyclic shift is variable; and an acquiring unit configured to control the column cyclic shift unit and the mapping unit, so as to obtain a group of column serial number distinguishable code group pairs where the same column has different column serial numbers in different code groups.